16 first time, just turned 26 the last time in 2016; I was a typical millennial boomeranger.
16 for boarding school and between then and end of uni at 21 I was only around in the holidays or on visits. Then stayed at home for a year to save whilst doing part time work and volunteering to meet uni PGCE course requirements before back out to uni for a PGCE at 22 with no intention to really return... but I had a mini breakdown. I am forever grateful for the time I spent at home, rebuilding myself between 23-26 and it was nice and needed- and I used to sublet during the summers as a favour to a mate and to give the DPs a break, but as soon as I had a decent enough paying job, a savings cushion and my confidence back, I went and was determined to stay away.
I managed it bar a 1 month end of rental gap over Christmas when buying my flat at 29. It was Dec 2019 so as much as we drove each other crazy, I am so glad for that time looking back now and knowing the pandemic was round the corner!